منابع مشابه
I . Search for Light Echoes
We have used FORS1 at the ESO VLT to search for light echoes in imaging polarimetry from four historical supernovæ in the face-on nearby spiral galaxy M83 (NGC 5236). No echoes were detected around our targets (SN 1923A, SN 1945B, SN 1950B and SN 1957D). This implies that the interstellar medium in their environs is rather tenuous (a few particles per cm), possibly as a result of previous super...
متن کاملLight Echoes in Type Ia Supernovae
Light echoes are a promising tool to probe the environment where SNe Ia explode and an independent source of information on the progenitor’s nature. After giving a brief introduction to the phenomenon we review the two known cases, i.e. SNe 1991T and 1998bu. We then present the results we obtained from the test case of SN 1998es in NGC 632. This object was classified as a 1991T-like event and w...
متن کاملOn the Search for Quasar Light Echoes
The UV radiation from a quasar leaves a characteristic pattern in the distribution of ionized hydrogenthroughout the surrounding space. This pattern or light echo propagates through the intergalacticmedium at the speed of light, and can be observed by its imprint on the Lyα forest spectra of background sources. As the echo persists after the quasar has switched off, it offers the possib...
متن کاملMultiple Light Echoes from Supernova 1993
Using the technique of PSF-matched image subtraction, we have analyzed archival HST/WFPC2 data to reveal details of at least two light-echo structures, including some unknown before now, around SN 1993J in the galaxy M81. In particular, we see one partial sheet of material 81 pc in front of the SN and tilted ∼ 60 • relative to the disk plane of M81, and another 220 pc in front of the SN, roughl...
متن کاملA Search for Candidate Light Echoes: Photometry of Supernova Environments
Supernova (SN) light echoes could be a powerful tool for determining distances to galaxies geometrically, Sparks 1994. In this paper we present CCD photometry of the environments of 64 historical supernovae, the first results of a program designed to search for light echoes from these SNe. We commonly find patches of optical emission at, or close to, the sites of the supernovae. The color distr...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2011
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921312000622